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Investments in Unconsolidated Entities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity method investments:      
Capital contributions, loans, advances and adjustments $ 105 $ 105  
Cumulative share of income 2,060 1,892  
Cumulative share of distributions (1,725) (1,563)  
Total equity method investments 440 434  
Measurement alternative method investments 7 7  
Total investments in unconsolidated entities 447 441  
Assets      
Current 1,477 1,261  
Noncurrent 5,725 4,962  
Total assets 7,202 6,223  
Liabilities and Equity      
Current liabilities 625 434  
Noncurrent liabilities 1,119 395  
Partners' capital and shareholders' equity 5,458 5,394  
Total liabilities and equity 7,202 6,223  
Results of Operations      
Revenues 6,903 6,777 $ 6,562
Operating expenses 5,022 4,965 4,965
Operating income 1,881 1,812 1,597
Other income (expense), net (22) 11 (1)
Net income $ 1,859 $ 1,823 $ 1,596